/* FRAME course: lesson stage, progress bar, questions and course cards.
   Uses the site's colour tokens so light and dark themes both work. */

.course-layout, .lesson-layout { padding-top: 2rem; padding-bottom: 3rem; }
.lesson { max-width: 48rem; }
.lesson-map { display: none; }
.side-card { display: none; }

/* Course landing */
.course-start { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; margin: 0 0 2rem; }
.course-progress-note { color: var(--muted); font-size: 0.9rem; }
.course-unit h2 { margin: 2rem 0 0.25rem; }
.course-unit > p { color: var(--ink-2); margin: 0 0 1rem; }
.course-lessons { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); }
.course-lesson a { position: relative; display: flex; flex-direction: column; gap: 0.35rem; height: 100%; padding: 0 0 1rem; background: var(--paper-2); border: 1px solid var(--rule); border-radius: 4px; text-decoration: none; overflow: hidden; }
.course-lesson a:hover { border-color: var(--accent); }
.course-lesson img { width: 100%; height: auto; aspect-ratio: 8 / 5; object-fit: cover; display: block; }
.course-lesson span { padding: 0 1rem; }
.course-lesson-num { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); padding-top: 0.5rem !important; }
.course-lesson-title { font-weight: 700; font-size: 1.1rem; }
.course-lesson-blurb { font-size: 0.9rem; color: var(--ink-2); }
.course-lesson-meta { font-size: 0.8rem; color: var(--muted); }
.course-tick { display: none; }
.course-lesson.is-done .course-tick { display: block; position: absolute; top: 0.6rem; right: 0.6rem; width: 1.6rem; height: 1.6rem; border-radius: 50%; background: var(--accent); padding: 0; }
.course-lesson.is-done .course-tick::after { content: ""; position: absolute; left: 0.5rem; top: 0.25rem; width: 0.4rem; height: 0.75rem; border: solid var(--accent-ink); border-width: 0 2px 2px 0; transform: rotate(45deg); }
.course-foot { margin-top: 2rem; color: var(--muted); font-size: 0.9rem; }

/* Lesson */
.lesson-goal { margin: 0 0 1.25rem; color: var(--ink-2); }
.lesson-time { color: var(--muted); }
.lesson-bar { position: sticky; top: 0; z-index: 5; background: var(--paper); padding: 0.6rem 0; border-bottom: 1px solid var(--rule); margin-bottom: 1.25rem; }
.lesson-count { display: block; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-bottom: 0.4rem; }
.lesson-progress { height: 6px; background: var(--rule); border-radius: 3px; overflow: hidden; }
.lesson-progress i { display: block; height: 100%; width: 0; background: var(--accent); transition: width 0.25s ease; }
.lesson-steps { list-style: none; margin: 0; padding: 0; }
.lesson-step { padding: 0 0 2.5rem; }
.lesson.is-live .lesson-step { padding: 0.25rem 0 1.5rem; min-height: 22rem; }
.lesson-step[hidden] { display: none; }
.lesson-step > h2 { margin: 0 0 1rem; font-size: 1.6rem; }
.lesson-defs { margin-bottom: 1.25rem; grid-template-columns: 1fr; }
.lesson-card { margin: 1.25rem 0 0; }
.lesson-card img { width: 100%; max-width: 20rem; height: auto; display: block; border-radius: 4px; }
.lesson-card figcaption, .lesson-figure figcaption { font-size: 0.8rem; color: var(--muted); margin-top: 0.4rem; }
.lesson-more { margin-top: 1.25rem; }
.lesson-figure { margin: 0 0 1rem; }
.lesson-figure img { display: block; max-width: 100%; max-height: 26rem; width: auto; height: auto; margin: 0 auto; background: var(--mount); border-radius: 2px; }
.lesson-note { display: block; margin-top: 0.25rem; }
.lesson-intro { margin: 0 0 1rem; color: var(--ink-2); }
.lesson-notice { margin: 0.75rem 0 0; font-size: 1.05rem; }
.lesson-question { font-size: 1.1rem; font-weight: 600; margin: 0.5rem 0 1rem; }
.lesson-options { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
.lesson-option { width: 100%; text-align: left; font: inherit; color: var(--ink); background: var(--paper-2); border: 1px solid var(--rule); border-radius: 4px; padding: 0.85rem 1rem; cursor: pointer; }
.lesson-option:hover:not(:disabled) { border-color: var(--accent); }
.lesson-option.is-right { border-color: #2e7d32; box-shadow: inset 4px 0 0 #2e7d32; }
.lesson-option.is-wrong { border-color: var(--accent); box-shadow: inset 4px 0 0 var(--accent); opacity: 0.75; }
.lesson-option:disabled { cursor: default; color: var(--ink); }
.lesson-feedback { margin: 1rem 0 0; padding: 0.85rem 1rem; background: var(--paper-2); border-left: 3px solid var(--muted); }
.lesson-feedback.is-right { border-left-color: #2e7d32; }
.lesson-feedback.is-wrong { border-left-color: var(--accent); }
.lesson-feedback[hidden], .lesson-why[hidden] { display: none; }
.lesson-why { margin: 0.75rem 0 0; }
.lesson.is-live .lesson-answer { display: none; }
.lesson-answer { margin-top: 1rem; }
.lesson-checklist { padding-left: 1.2rem; }
.lesson-checklist li { margin-bottom: 0.6rem; }
.lesson-finish { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; margin-top: 1.5rem; }
.lesson-nav { display: flex; justify-content: space-between; gap: 1rem; padding-top: 1rem; border-top: 1px solid var(--rule); }
.lesson-nav[hidden], .lesson-bar[hidden] { display: none; }
.lesson-nav .button { min-width: 6.5rem; text-align: center; cursor: pointer; }
.lesson-nav .lesson-prev { background: transparent; color: var(--ink); border-color: var(--rule); }
.lesson-nav .button:disabled { opacity: 0.4; cursor: default; }
.lesson-nav .lesson-next[hidden] { display: none; }
.lesson-nav .lesson-next { margin-left: auto; }

@media (max-width: 40rem) {
  .lesson-step > h2 { font-size: 1.35rem; }
  .lesson.is-live .lesson-step { min-height: 0; }
  .lesson-figure img { max-height: 20rem; }
}

/* Side panels: fill the desktop margins; stacked under the content on small screens. */
.course-side, .lesson-side { margin-top: 2rem; }
.side-box { background: var(--paper-2); border: 1px solid var(--rule); border-radius: 4px; padding: 1rem 1.15rem; margin: 0 0 1rem; }
.side-box .glance-label { margin: 0 0 0.6rem; }
.side-box p { margin: 0 0 0.6rem; font-size: 0.92rem; }
.side-box p:last-child, .side-box ul:last-child { margin-bottom: 0; }
.side-box .plain-list { font-size: 0.92rem; }
.side-keep { border-left: 3px solid var(--accent); }
.side-steps { margin: 0; padding-left: 1.2rem; font-size: 0.92rem; }
.side-steps li { margin-bottom: 0.35rem; }
.side-stat { font-size: 0.95rem; }
.side-stat strong { font-size: 1.35rem; margin-right: 0.25rem; }
.side-card { margin: 0 0 1rem; }
.side-card img { width: 100%; height: auto; display: block; border-radius: 4px; }
.side-card figcaption { font-size: 0.75rem; color: var(--muted); margin-top: 0.35rem; }
.course-progress-side { margin: 0; font-weight: 600; }
.course-progress-side[hidden] { display: none; }
.lesson-more-link { font-size: 0.9rem; }

.lesson-map { list-style: none; margin: 0; padding: 0; }
.lesson-map li { margin: 0; }
.lesson-map a { display: flex; gap: 0.6rem; align-items: baseline; padding: 0.3rem 0.4rem; margin: 0 -0.4rem; border-radius: 3px; text-decoration: none; font-size: 0.9rem; color: var(--ink-2); }
.lesson-map a:hover { background: var(--paper); color: var(--ink); }
.map-num { flex: none; width: 1.4rem; height: 1.4rem; line-height: 1.4rem; text-align: center; border-radius: 50%; border: 1px solid var(--rule); font-family: var(--mono); font-size: 0.7rem; }
.lesson-map a.is-seen .map-num { background: var(--rule); color: var(--ink); }
.lesson-map a[aria-current="step"] { color: var(--ink); font-weight: 700; }
.lesson-map a[aria-current="step"] .map-num { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }

@media (min-width: 64rem) {
  .course-layout, .lesson-layout { display: grid; grid-template-columns: minmax(0, 1fr) 21rem; gap: 3rem; align-items: start; }
  .lesson { max-width: none; }
  .course-side, .lesson-side { position: sticky; top: 1.5rem; margin-top: 0; }
  .lesson-map { display: block; }
  .side-card { display: block; }
  .lesson-defs { grid-template-columns: repeat(3, 1fr); }
  .lesson-split { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 1.75rem; align-items: start; }
  .lesson-split .lesson-figure { margin: 0; }
  .lesson-split .lesson-notice { margin-top: 0; }
  .lesson-split .lesson-question { margin-top: 0; }
  .lesson.is-live .lesson-step { min-height: 26rem; }
  .course-lessons { grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr)); }
}